ABB REB670 Series Applications Manual page 261

1MRK 505 370-UEN D
12.1.3.1 Single circuit breaker with single busbar
WA1_MCB
IEC10000093 V4 EN-US
Figure 125: Connection of SESRSYN function block in a single busbar arrangement
Figure 125
is one voltage transformer on each side of the circuit breaker. The voltage transformer circuit
connections are straightforward; no special voltage selection is necessary.
The voltage from busbar VT is connected to U3PBB1 and the voltage from the line VT is
connected to U3PLN1. The conditions of the VT fuses shall also be connected as shown above.
The voltage selection parameter
12.1.3.2 Single circuit breaker with double busbar, external voltage selection
WA1_MCB
IEC10000094 V4 EN-US
Figure 126: Connection of SESRSYN function block in a single breaker, double busbar
In this type of arrangement no internal voltage selection is required. The voltage selection is
made by external relays typically connected according to figure 126. Suitable voltage and VT
fuse failure supervision from the two busbars are selected based on the position of the busbar
disconnectors. This means that the connections to the function block will be the same as for
the single busbar arrangement. The voltage selection parameter
sel .
Busbar protection REB670
Application manual
WA1
QB1
QA1
LINE
illustrates connection principles for a single busbar. For the SESRSYN function there
CBConfig is set to No voltage sel .
WA1
WA2
WA2_MCB
QB1
QB2
QA1
LINE
arrangement with external voltage selection
WA1_VT
GRP_OFF
LINE_VT
WA1_MCB
WA1_MCB
WA1_VT
LINE_MCB LINE_MCB
LINE_VT
WA1_MCB / WA2_MCB
WA1_VT / WA2_VT
LINE_MCB
LINE_VT
SESRSYN
U3PBB1*
U3PBB2*
U3PLN1*
U3PLN2*
UB1OK
UB1FF
ULN1OK
ULN1FF
IEC10000093-4-en.vsd
WA1_VT/
SESRSYN
WA2_VT
U3PBB1*
GRP_OFF
U3PBB2*
LINE_VT
U3PLN1*
U3PLN2*
WA1_MCB/
WA2_MCB UB1OK
UB1FF
LINE_MCB
ULN1OK
ULN1FF
IEC10000094-4-en.vsd
CBConfig is set to No voltage
Section 12
Control
M12324-3 v12
M12325-3 v8
255